virtualbox additions issue

[Beeblebrox]

virtualbox additions have not been working for quite some time.
I start virtualbox services with a script:

#!/bin/sh
kldload vboxdrv
kldload vboxguest
service vboxnet onestart
service vboxguest onestart
service vboxservice onestart

And I get this error:

Starting vboxservice.
VBoxService: error: VbglR3Init failed with rc=VERR_FILE_NOT_FOUND
/usr/local/etc/rc.d/vboxservice: WARNING: failed to start vboxservice

pkg info:
virtualbox-ose-4.3.12_1  General-purpose full virtualizer for x86 hardware
virtualbox-ose-additions-4.3.12  VirtualBox additions for FreeBSD guests
virtualbox-ose-kmod-4.3.12  VirtualBox kernel module for FreeBSD

~/.VBoxSVC.log shows:
00:00:01.121163 nspr-2   ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005)
aIID={1254a96a-ae57-4484-946a-22d86c1f98af} aComponent={SystemProperties}
aText={Cannot determine default Guest Additions ISO location. Most likely
they are not available}, preserve=false




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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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